Revan only has stuff to prove that he's powerful. But not how powerful. Until some new piece of lit comes out that gives us a precise indication of Revan's power, he's unknown. Simple as that. Could he beat RotS Anakin? Possibly. Can we say for sure? No. That's not what the thread's asking, though. But the thread's topic is invalid, because we haven't seen Anakin at his full potential. And we never will.